William Castle (disambiguation)

William Castle (1914–1977) was an American film director, producer, and actor.

William Castle may also refer to:


 * William Castle (shipbuilder) (c. 1615-1681) English shipbuilder for the Royal Navy
 * William Castle (tenor) (1836–1909), English tenor active in the United States
 * William B. Castle (1814–1872), American politician from Ohio
 * William Bosworth Castle (1897–1990), American physician and physiologist
 * William E. Castle (1867–1962), American geneticist
 * William Richards Castle (1849–1935), lawyer, politician and Attorney General of Hawaii
 * William Richards Castle Jr. (1878–1963), U.S. educator, diplomat and ambassador to Japan